i don't think oak cubes (if you want to do it properly, don't use chips IMHO) are that expensive, i'd just buy some if i were you. i don't know that anyone on this site has a significant knowledge of how oak barrels are toasted (how long, what kind of flame, etc.) and what would be a decent substitute for it. of course, if you are dead set on doing it yourself, only trial and error will answer the questions.
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